.net 组件

 1、ComboBox:

private void cb_SelectedIndexChanged(object sender, EventArgs e)

        {

            MessageBox.Show("你选中的是："+((ComboBox)sender).SelectedItem.ToString());

        }

2、RadioBox

            String name = tbName.Text;

            String sex = rbFemale.Checked ? "女" : "男";

            String country = cb.SelectedItem.ToString();

            MessageBox.Show("你的姓名是："+name+"，性别为"+sex+"，来自"+country);

3、ListView:column属性 item属性

//添加行

        private void add_Click(object sender, EventArgs e)

        {

            String id = tbID.Text.ToString();

            String name = tbName.Text.ToString();

            ListViewItem row = new ListViewItem();

            row.SubItems[0].Text = id;

            row.SubItems.Add(name);

            listView1.Items.Add(row);

        }

4、画线

Pen pen = Pens.Red;

            Point p1 = new Point(0, 0);

            Point p2=new Point(this.ClientSize.Width,this.ClientSize.Height);

            Graphics g = this.CreateGraphics();

            g.DrawLine(pen, p1, p2);

5、画圆

Pen pen = Pens.Blue;

            Graphics g = this.CreateGraphics();

            g.DrawRectangle(pen, 0, 0, 50, 50);

            g.DrawEllipse(pen,50,0,50,50);//g.DrawEllipse(pen,int x,int y,int width,int height) 外接矩阵

6、画图

Image img = Image.FromFile("c://1.png");

            Graphics g = this.CreateGraphics();

            g.DrawImage(img,0,0);

public void DrawImage(	Image image,	Rectangle rect)

public void DrawImage(    //在指定位置并且按指定大小绘制指定的 Image 的指定部分。	Image image,	Rectangle destRect,	Rectangle srcRect,	GraphicsUnit srcUnit// 枚举的成员，它指定 srcRect 参数所用的度量单位。)